Another alternative interpretation of the results suggests that newborn infants track the probabilities of the succession of sound events (e.g., the probability that the hi-hat and bass sound event is followed by a hi-hat sound alone). However, in this case, some of the standard patterns (e.g., S2) should also elicit a discriminative response, because the omission has a low conditional probability (e.g., the probability that the hi-hat and bass sound event is followed by an omission, as it occurs in S2, is 0.078 within the whole sequence).